Sheet material



FIG. 1 is a view of a sheet material according to the present design; and,

FIG. 2 is an enlarged detail of part 2 circumscribed on FIG. 1.

The sheet material is flat and planar and depth forms no part of the claimed design. It is understood that the pattern is intended to be applied uniformly to the entire surface of the sheet material. 

CLAIM The ornamental design for a sheet material, as shown and described. 